Phone has a little cartride with several odorants. Instead of ringing the phone can release puffs of some smell. When the ringer is off the caller receives an announcement like "The party you are calling has disabled the ringer but may be available. You can notify the party about your desire to communicate
with a puff of odorant please enter:
(1) for cherry
(2) for lemon
(3) for boiled cabbage
(4) to raise a real stink"
This will lead to a whole new market for phone smells, similar to exchangeable face plates and ring tones. There will also be follow up inventions like tubes that guide the smell from the phone in your pocket to your nose. Watch the economy boom!

Keitai Kunkun - Is the first among the world!http://www.pixen.co.../keitai_kunkun.htmlThis probably works on the same principle as the little "light-up" cell phone pendants, which would mean that it doesn't work with run-of-the-mill US cellphones. Still, it's nice to know someone's covered this. [jutta, Dec 05 2005]

How about something like a color printer cartridge? Instead of having cartridges for the smell of cherry, or lemon, ect... we have odor ingredients to make various smells. Such as a person could talk on the cell phone to another person and use a "smell capture" feature and transmit that smell to your friends phone.

//:How will you stop the smells lingering around the phone while you talk on it?://
I have a Nokia 5120 so my phone is not state-of-the-art, but what about a flip-phone with the scent nozzle by the hinge pointed towards your nose. This could also help people use the correct ear-to-front angle your supposed to use with cellular phones. (Which, again, is not so important with the flip phones anymore with the speaker between your ear and the antenna. This also could help to use scent more efficently also.